Guide To: ECE R4 - Registration Plate Lamps

UN ECE R4, or Regulation No. 4 of the Economic Commission for Europe of the United Nations, is a regulation that specifies the requirements for devices for the illumination of rear registration plates of power-driven vehicles and their trailers. These devices are used to make registration plates visible at night and in poor weather conditions.

UN ECE R4 applies to devices that are either stand-alone or built into other light units, such as combination or multi-function lights. The regulation specifies the size, shape, color, and photometric performance of devices for the illumination of rear registration plates. It also specifies the test methods that must be used to verify that these devices meet the requirements of the regulation.

UN ECE R4 is recognized by many countries around the world. This means that devices for the illumination of rear registration plates that have been approved under UN ECE R4 can be used on vehicles in these countries.

Here are some of the key requirements of UN ECE R4:

Devices for the illumination of rear registration plates must be white in color. Devices for the illumination of rear registration plates must have a minimum size of 150 mm x 150 mm. Devices for the illumination of rear registration plates must have a minimum photometric performance of 100 mcd/lux/m2. Devices for the illumination of rear registration plates must pass a series of tests to verify that they meet the requirements of the regulation. UN ECE R4 is an important regulation that helps to improve the safety of vehicles on the road. By requiring devices for the illumination of rear registration plates to meet certain standards, the regulation helps to ensure that these devices are effective in making registration plates visible at night and in poor weather conditions.